Where to begin.
I don’t know if you meant to start your story with the word mouthfeel and end it with how you were taught to give blowjobs, but there is definitely a joke somewhere in there if you care to make it.
It strikes me that no matter what millennials do they are going to be told they suck. Remember the dangers of “hook-up” culture? Remember how we were all having uncommitted sex all the time? Now apparently not fucking enough?
Like you said at the outset. Sex is a personal endeavor not to be analyzed beyond the person/people having it.